Function isSupportsRule

src/inject/dynamic-theme/css-rules.ts:233–248

(rule: CSSRule | null)

}

export function isSupportsRule(rule: CSSRule | null): rule is CSSSupportsRule {
    if (!rule) {
        return false;
    }
    if (styleRules.has(rule)) {
        return false;
    }
    if (supportsRules.has(rule)) {
        return true;
    }
    if (rule instanceof CSSSupportsRule) {
        supportsRules.add(rule);
        return true;
    }
    return false;
}

export function isLayerRule(rule: CSSRule | null): rule is CSSLayerBlockRule {
    if (!rule) {